I agree with mtmaughan. A week's difference between the babies is a pretty big difference, so you might want to be watchful about the big ones bullying the little ones. I've had 2 mice have litters a day or 2 apart, but no more than that, and it always works out well. Both moms feed the babies and care for them and if the pile is too big, they sometimes divide them in 2 or 3 smaller piles so they can handle them all (I used to have mice that had 20-25 babies, so the piles could get very big if I had 2 give birth in the same week).
As mtmaughan said, check of milk bellies on the little ones, if you need to separate them, separate the mom with the bigger babies, and put some of the old bedding in the new cage to keep things familiar to the mom and she doesn't freak out too much.
As you continue breeding, I advice you that you keep the male apart from the females, and place a female or 2 with the male at a time, leaving them one week with him and then moving them back to their original cage to give birth. That way they won't get pregnant right away after giving birth, which will make it easier for the mom's bodies and for you on keeping your numbers in a high enough quantity that you have enough food for your reptiles, but not too high as to have too many mice.
Also, keeping the females in groups is a good idea, since all the mice in the cage will help in raising the babies, (moms or not moms) however, groups that are too big will then to be chaotic, as some mice will want to move the babies one way and the other want them somewhere else and you'll end up with babies scattered everywhere. Groups of 2-4 work the best.
If you need any help or advice let me know, and good luck with the little ones!!